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How many of the factorials from 1! to 100! are divisible by 9?

 Jun 11, 2020
 #1
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+2

Every factorial from 6! and up all the way to 100!

 Jun 11, 2020
 #2
avatar+986 
+2

I agree with guest.

 

6 = 2*3, and all factorials forward include this 3 and 6.

 

So all from 6-100 that's 1-95.

 

95 are divisible by 9.

 Jun 12, 2020
 #3
avatar+549 
+1

Thanks!

amazingxin777  Jun 12, 2020

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